From 717648f9f878226748ea19594e423ac52def7a7d Mon Sep 17 00:00:00 2001
From: Alexander Arlt <alexander.arlt@arlt-labs.com>
Date: Mon, 22 Jan 2024 15:27:58 +0100
Subject: [PATCH] Fix dependency cache.

---
 .circleci/config.yml | 48 ++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 44 insertions(+), 4 deletions(-)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 8a771e69596f..fd50ef90f85a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -364,11 +364,51 @@ commands:
 
   install_dependencies_osx:
     steps:
-      # FIXME: We used to cache dependencies on macOS but now it takes longer than just installing
-      # them each time. See https://github.com/ethereum/solidity/issues/12925.
+      - restore_cache:
+          keys:
+            - b_osx-dependencies-{{ arch }}-{{ checksum ".circleci/osx_install_dependencies.sh" }}-flag
       - run:
-          name: Install build dependencies
-          command: .circleci/osx_install_dependencies.sh
+          name: Checking dependency flag
+          command: |
+            if test -f ~/b_osx-dependencies-flag
+            then
+              echo "Dependency flag exists: removing /usr/local and /opt/homebrew directories. These directories will be restored from cache."
+              sudo rm -rf /usr/local/*
+              # circleci is providing the circleci cli tools via some kind of symlink magic.
+              # so we just save the original symlinks and using them later.
+              mv /opt/homebrew/bin/circleci /tmp/circleci
+              mv /opt/homebrew/bin/circleci-agent /tmp/circleci-agent
+              sudo rm -rf /opt/homebrew
+              sudo mkdir -p /opt/homebrew/bin
+              sudo chmod 777 /opt/homebrew
+              sudo chmod 777 /opt/homebrew/bin
+              mv /tmp/circleci /opt/homebrew/bin/circleci
+              mv /tmp/circleci-agent /opt/homebrew/bin/circleci-agent
+              sudo chmod 777 /usr/local
+            else
+              echo "Dependency flag didn't exist: installing dependencies."
+              .circleci/osx_install_dependencies.sh
+              if test -f /usr/local/lib/libz3.a
+              then
+                echo "/usr/local/lib/libz3.a found: setting dependency flag."
+                touch ~/b_osx-dependencies-flag
+              else
+                echo "Dependencies not build."
+              fi
+            fi
+      - save_cache:
+          key: b_osx-dependencies-{{ arch }}-{{ checksum ".circleci/osx_install_dependencies.sh" }}-flag
+          paths:
+            - ~/b_osx-dependencies-flag
+      - restore_cache:
+          keys:
+            - b_osx-dependencies-{{ arch }}-{{ checksum ".circleci/osx_install_dependencies.sh" }}
+      - save_cache:
+          key: b_osx-dependencies-{{ arch }}-{{ checksum ".circleci/osx_install_dependencies.sh" }}
+          paths:
+            - /usr/local
+            - /opt/homebrew
+
 
 defaults: